Justin Bieber turned the big 2-1 on Sunday, March 1, and he celebrated with lots of lovely ladies around him.

According to TMZ, Justin feted his 21st birthday ‘popping champagne on a private island’ near Grenada on Saturday, Feb. 28. A video posted to Twitter shows him dancing shirtless to 50 Cent’s “In Da Club,” as fellow partygoers wave sparklers in the air around him.

WATCH VIDEO BELOW:

One of those partygoers was pal Hailey Baldwin. She shared a photo from the bash via Instagram, of herself hugging JB from behind as he stares dazedly into the camera. The two have been spotted hanging out in recent months, but both deny they’re more than friends.

Rumored former hookup Yovanna Ventura also posted a picture from the party on Saturday. In the shot, she halfway straddles JB, one leg around his waist, as he pulls her close and grabs the underside of her thigh.

“Happy birthday!!” she captioned the photo.

JB himself tweeted a couple of updates to fans in the hours leading up to his actual birthday. “Grateful to be alive!!! Love u!!! 21,” he wrote. “I love everybody!”

Hours later, he shared a goal for the coming year. “Thanks for all the birthday love. Grateful for everything,” he tweeted. “Let’s be better this year. Thanks.”

To Beliebers everywhere, March 1, 2015, is a day of incredible magnitude — Justin Bieber’s 21st birthday. Social media Twitter has been buzzing with Bieber activity, with hashtags like #21ReasonsWhyWeLoveJustin, #HappyBirthdayJustinBieber and the supremely creepy #FetusJustinSpamBefore21 trending across the world.

Justin Bieber is officially a legal adult now! As he turned 21 years old on March 1, we compiled 21 things what we love about him.

Happy Birthday, Justin!

21 Reasons why we love Justin Bieber!

1. He’s crazy talented and has an amazing voice.
2. He’s, like, really, really good-looking. He’s so pretty it hurts.
3. He is a fashion icon.
4. Think of all the hairstyles he can pull off! Blond! Brown! Somewhere in between! Bangs! Combover! Wow!
5. He’s humble even when he’s filthy rich.

6. He does a lot of charity work. Not just since he’s become a changed man last month. Since the beginning of the Biebs, he’s actively participated in charities.

7. He’s the most famous kid in the world.
8. He is an inspiration. He taught us to never give up on our dreams.
9. He can shake that booty.

10. Unlike most celebrities, Justin started from nothing. He achieved great success without having rich parents.
11. He knows he has made mistakes and he owns up to them.
14. He loves kids.

#TheDress phenomenon began after a woman posted a photo of her mother’s dress for her wedding on Tumblr… asking people to ID the color. From there … EXPLOSION … with the likes of Justin Bieber (blue and black), Ariana Grande (grey and blue), Kim Kardashian (white and gold), Demi Lovato (blue and black) and Taylor Swift (blue and black) all weighing in.

So are you a “the dress is blue and black” kind of person? Well, according to Dr. Stephen Macknik, professor of ophthalmology and neurology at State University of New York, Justin Bieber and other celebrities could be to blame.

Dr. Macknik told MTV News:

“When you have someone famous saying they see something a certain way, then all of their followers are going to tend to want to believe them.”

He also took a look at all that coverage and came to the following conclusion:

“I don’t believe that this is a issue of the brain. I don’t think that this is an interesting neuroscientific issue at all — I think that this is a photographic presentation issue. And it has simply to do with the amount of contrast in the image presented by different monitors.”

So, how you see the dress depends on what computer or device you’re using and its screen, according to Macknik.

“Some of the experts are saying that you could get this effect through color constancy or through different kinds of effects probably not due to color-blindness of things in the retina,” Macknik said.

“The dress can either be white and gold underneath a blue light, or it can be blue and black under a dim gold light — that can explain what everyone is seeing. The reason that you see different things depending on who you are would have to do with the way that the dress is being presented to you on your monitor. … The luminance of the monitor gives you different effects.

“What this looks like to me, is that someone took a photograph of this dress with a camera that wasn’t very high-quality with a lot of back-lighting and they uploaded it, and that image has been seen by various people under different luminance conditions on their screens so that you can see it as either white and gold or blue and black.”

A rep for the company that makes the dress, Roman Originals, tells TMZ the dress is blue and black, but it also comes in pink and black, white and black and red and black. There isn’t a white and gold option yet … but Roman is looking to add it to the line because of all the commotion.

Justin Bieber is set to celebrate the milestone — 21st birthday — on Sunday March 1st, but he kicked off his celebrations early after John and Sammy Shahidi presented him with a 1965 Lincoln Continental last night.

A source said his close pals, who are also his business partners in the selfie-app Shots, spent approximately $20,000 getting the car completely restored over the past few months.

Justin was clearly thrilled with the gift as he spent much of Friday night driving it up and down the Sunset Strip in Los Angeles, according to TMZ.com.

The insider said the car looks similar to the one that features in the opening credits of ‘Entourage,’ which was one of Justin’s favurite TV shows.

Justin Bieber put in a special request on Twitter last night for his upcoming Comedy Central Roast: He wants Seth Rogen to get in on the fun.

The actor has been very open with his distaste for Justin, having previously said that he hates him.

“[Justin’s] a good example of someone you meet, who you think you’re going to hate, and then you get to hate him as much as you thought. You meet him, and he lives up to every one of your expectations of how you hope he will be.”

The slamming didn’t stop there. Rogen continued to rehash a story about when he and JB both appeared on a German talk show, only to further criticize him by referring to him as a “d-ck” and “motherf-cker.”

The feud came to a head on Twitter when Rogen solidified his hatred by posting, “All jokes aside, Justin Bieber is a piece of shit.”

But now, it looks like Justin is ready to take Rogen’s head on by asking him to roast him during his special. In honoring their social media feud, Justin made his request on Twitter.

“@Sethrogen all I want for my birthday is for you to roast me. I took the twitter bashing please make my bday and do it in person. Thanks,” he wrote.

Justin also made light of Rogen’s radio and TV interviews when he followed up with another tweet that said, “@Sethrogen I would have emailed u but this is the only electronic communication with u that doesn’t scare me. Hope to see u at the roast :).”

A new Diplo and Skrillex song featuring Justin Bieber premiered on Thursday. Called “Where Are U Now,” the song’s title has already become a worldwide trending topic.

Interestingly, Justin has his own song called “Where Are You Now,” which was featured on his debut studio album, My World 2.0 back in 2010 as a bonus on editions sold at Walmart and in Australia. This is NOT remix of that track, but any entirely new song with differently lyrics and music. Diplo and Skrillex have created an uptempo beat that features Justin singing softly, essentially combining EDM with a breakup ballad. Justin announced the collaboration on Twitter Thursday night just as it debuted, writing, “Wrote a song. #JackU @Skrillex @diplo #WhereAreÜNow.”

Listen “Where Are U Now” below!

Skrillex & Diplo ft. Justin Bieber – Where Are U Now Lyrics:

I need you, I need you, I need you, I need you
I need you, I need you, I need you, I need you
I need you the most

I gave you the key when the door wasn’t open
Just admit it
See I gave you faith and you doubt it it open, can’t deny it
Now I’m all alone and my choice to the open

Tell me he, where are you now that I need you?
Where are you now?
Where are you now that I need ya?
Couldn’t find you anywhere

Where you broke down I didn’t leave ya
I was by your side

So where are you now that I need ya?
Where are you now that I need ya?
Where are you now that I need ya?
Where are you now that I need ya?
Where are you now that I need ya?

I gave you attention when nobody else was payin’
I gave you the shirt off my back when nobody else was sayin’
To keep you warm
I showed you the game everybody else was playin’, that’s for sure
And I was on my knees when nobody else was prayin’, oh lord

Where are you now that I need ya?
Where are you now that I need ya?
Where are you now that I need ya?

I need you, I need you, I need you, I need you
I need you, I need you, I need you, I need you
I need you the most

Where are you now that I need ya?
Where are you now that I need ya?
Where are you now that I need ya?

I need you the most
I need you the most
I need you the most

Skrillex and Diplo joined forces a few months ago to form a new super-power electronic producing duet with the alias of “Jack Ü”. The duo dropped their long awaited debut album as a duo titled simply Skrillex and Diplo Present Jack Ü. The LP is packed with features from artists big and small, but the big-ticket features come from Justin Bieber, 2 Chainz and AlunaGeorge.

According to Celeb Digs, Justin’s new Beverly Hills pad boasts 6,000 square ft. of space, five bedrooms, and six bathrooms. It is reportedly around 1,500 square feet smaller than his last rental, but photos of the stunning pool with a colorful lighting system and high-finish interiors show why he may not mind the reduced size.

The new mansion has terrazzo floors and hardwood throughout, and from a steam shower to a home theater, this seems like the perfect spot for him. There are large windows and sweeping city views, and the pool area has a colorful lighting system, which is something Justin has been a fan of at his other residences.

After moving out of his Calabasas mansion last year, Justin briefly settled in to a Beverly Hills condo, and after allegedly causing chaos there, he started leasing a $60k-a-month mansion in the Hollywood Hills.

Of course, wherever he goes, the all-night parties follow, and after a number of complaints from his neighbors, Justin moved out earlier this month.